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Old 02-09-2014, 07:13 PM   #1
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ISL 400 Serpentine Belt

Can anyone tell me which belt I need to order. The more I search online, the more confused I am by all of the choices. I know I have an 8 rib belt, but other than that I'm clueless.
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Old 02-09-2014, 07:17 PM   #2
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If you can find it. There should be a part number on the belt. Then you can match it up. May have a second belt also. Be sure to change both while your in there.
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Old 02-09-2014, 07:22 PM   #3
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This thread might just help you out Serpentine drive belt
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Old 02-10-2014, 10:38 AM   #4
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The belt on my 2005 400ISL has part number 3289224 stamped on the belt.
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Old 02-10-2014, 11:08 AM   #5
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Belts were different by a few inches over the years depending on pulley sizes, mounting brackets, etc. My recommendation is to remove the belt (including AC belt as recommended above). Stretch the belt flat (doubled) & measure, multiply by 2. Go to a website like Ryder Fleet Products & find their wide ribbed belts selection. Click on a few examples to ascertain the "nomenclature" of the part number/name. E.g. the Dayco 5080780 (second belt in second row from link above) is an 8 rib x 78" belt. If you need a 76" belt, you'd be looking for a 5080760, a 76.5" would be 5080765, etc. You'll also notice at the bottom of the belt description is a list of "interchange" part#'s; some of those look suspiciously like Cummins part#'s and some like competing mfgr's parts.

Take the v-belt to an autoparts store, they should be able to match it over the counter. If they can't, find a better auto parts store (I find NAPA has the best training at least at stores I've frequented).
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Old 02-10-2014, 12:59 PM   #6
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Thanks for all of the responses. I removed the belt and it has a Cummins part number - 3911620. My manual calls for a 3912004. When I search on Yoyoparts.com, I find both part numbers cross reference to the same replacement belt.

I'll go to NAPA and see if I can get a replacement and also change the A/C compressor v-belt.
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Old 02-10-2014, 01:53 PM   #7
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NAPA had the belts in stock. The NAPA serpentine belt is P/N 25-080680. The A/C compressor belt is P/N 25-9476 HD. The HD means it's a heavy duty NAPA Fleetrunner Green Line belt.
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